721341224 has 16 divisors (see below), whose sum is σ = 1352985120. Its totient is φ = 360545200.

The previous prime is 721341223. The next prime is 721341227. The reversal of 721341224 is 422143127.

It is a super-2 number, since 2×721341224² = 1040666322883636352, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 721341193 and 721341202.

It is not an unprimeable number, because it can be changed into a prime (721341223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11549 + ... + 39699.

It is an arithmetic number, because the mean of its divisors is an integer number (84561570).

Almost surely, 2^721341224 is an apocalyptic number.

It is an amenable number.

721341224 is a deficient number, since it is larger than the sum of its proper divisors (631643896).

721341224 is a wasteful number, since it uses less digits than its factorization.

721341224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31360 (or 31356 counting only the distinct ones).

The product of its digits is 2688, while the sum is 26.

The square root of 721341224 is about 26857.7963355149. The cubic root of 721341224 is about 896.8371381330.

The spelling of 721341224 in words is "seven hundred twenty-one million, three hundred forty-one thousand, two hundred twenty-four".